Will Shortz Presents the Dangerous Book of Kenken: 100 Very Hard Logic Puzzles That Make You SmarterPaperback, 3 July 2012

Puzzle fans have fallen for KenKen and now crave more challenging puzzles. The puzzles in this edition range in size from 6x6 grids to 9x9 grids and for the first time there will also be grids without application symbols. It's the ultimate KenKen challenge!

This edition will also include How to Solve instructions and an introduction by puzzlemaster Will Shortz.

Includes:
*100 very challenging KenKen puzzles
*Puzzles range in size from 6x6 grids to mind-bending 9x9 grids
* Introduction and solving instructions by puzzlemaster Will Shortz